Liquid-fuel burner



oct. 16, 1928. 1,687,888

' J. O. POST LIQUID FUEL BURNER Filed July 16, 1926 z'sheets-shee't 1 Oct. 16, 1928. 1,687,888

J. o. Pos1 LIQUID FUEL BURNER Filed July 16, 1926 2 Sheets-Sheet 2 Patented Oct. 16, 1928.

.UNITED STATES JAMES )TIS POST, 0F MORBISTOWN, NEW JERSEY.

LIQUID-FUEL BURNER.

Application lcd July 16,

This invention relates to liquid fuel burners and has for its primary object to provide an improved constructionand arrangement of parts in a device of thls-nature whereby the consumption of fuel mayl be better controlled in such a manner as to-provide a maximum or minimum combustion of the fuel under improved conditions; whereby the fuel may be preheated in a chamber from which air is excluded and supplied to the combustion zone under pressure either in the form of a vapor, or in the form of a spray of finely divided particles of fuel or in the form of a mixture of vapor and liquid fuel particles; whereby said fuel may be supplied to the combustion zone thru an outlet submerged in preheated fuel; whereby air projected on to the burner may be equally distributed over it; and whereby said burner may be utilized for maintaining a pilot lightwhen the burner is not in service.

One of the objects of my invention is to provide a liquid-fuel burner of improved construction whereby the liquid-fuel may be preheated and vaporized in a chamber which is sealed by preheated fuel and discharged thru a sealed outlet in the form of a vapor, spray, or mixture of vapor and spray across an extended heated area which forms a combustion zone around and about said sealed chamber.

Another object is to provide an improved air preheating manifold for a liquid fuel burner.

Another object of my invention is to provide an improved discharge outlet or nozzle for liquid fuel burners of the'character hereinafter described.

' In the accompanying drawings which exemplify my invention in a preferred embodiment,

Figure 1 is a vertical section of a preferred embodiment of my improved burner;

Figure 2 is a side elevation of the dome cap removed;

Figure 3 is a front elevation of the air manifold; and

Figure L1 is a top plan view of the burner with the air manifold removed.

According to the preferred embodiment of my invention shown in the drawings, the base member of my improved burner is provided with an under support or overflow pan 1 supported on a layer of asbestos board on e5 f,grate bars 2, said pan being provided with 1926 Serial No. 122,899.

a fiat annular portion 3 for this purpose. Surmounting the overiow pan 1 and centrally disposed with respect thereto, is a casting 4 provided with a series of concentric grooves 5, each of said grooves being depressed with respect to the next groove of smaller diameter so that any excess of liquid fuel within an upper 'groove of' smaller diameter overflows into the next lower groove of larger diameter until (1f the flow of fuel is made suiciently large) it flows over into a relatively larger groove 6 formed as an annular depression in the upper face of the overflowpan 1. An overflow pipe 7 which has its upper end openinn' into the overflow groove 6, leads to a sa ety cut-olf (not shown on the drawings).

A raised central portion 8 of the burner is provided on top v. ith a basin 9 for receiving the incoming fuel from a supply pipe 10. A circular groove or depression 12 is adapted to receive the overfiowvfuel from the basin 9 and, under some conditions, there may be an overflow of fuel into the uppermost groove 5 of the burner.

Arranged above the raised central portion 8 of the burner block and forming a domed chamber above the fuel basin 9, is a dome or cap 13 of approximately semi-spherical shape, said dome or cap being provided below with an under cut peripheral groove 14: to

form an overhanging ledge or shoulder 15 and a downwardly-presented circular flange 16 of reduced diameter. Projecting downwardly from the flange 16 are a plurality of supporting feet 17 adapted to support the dome or cap 13 and to form a circular series of outlet ports or openings which constitute the only channels of communication between the preheating or vaporizing chamber within the dome or cap and the outside air.

Referring now to Figures 3 and 4, .an aii` heating manifold 18 may be arranged above and in axial alinement with the burner described above. Said manifold comprises in the present embodiment of my invention, an

intake pipe 19 which opens upwardly into a substantially spherical-segmental air preheating chamber 2O within the manifold. Said intake pipe 19 may be preferably arranged to receive cold air from below the grate bars of a furnace, the air thus supplied being preheated in the widened chamber 2O and discharged downwardly thru a pipe 21 and against the rounded upper surface of the dome or cap 13.

In order to properly position the manifold 18 with respect to the burner block, said man1- fold may be provided with legs or supports 23 'adapted to rest upon a iattened surface 24 which extends around the outer periphery of overflow pan 1.

As shown in Figure 1, it will be seen that the overhanging ledge or shoulder is suitably spaced from the outer peripheral edge 22 of the enlarged lower portion 11 of the burner block to form a full circular discharge outlet or nozzle from which the vapor and liquid fuel spray is projected across the burner casting 4. f f

In operation, the overhead draft from the air manifold strikes downwardly upon the upper surface of the dome or cap and is deflected outwardly thereby in such a way that it does not reach the fuel until the fuel is superheated and part-1y or entirely vaporized. At the same time, it will be noted that vaporized fuel from within the fuel-pre heating chamber is forced through preheated fuel and thus atomizes the fuel and sprays it over the hot burner casting 4 under gaseous pressure. Combustion is thus made practically instantaneous and responsive to the amounts of liquid fuel admitted into the fuel basin within the preheating chamber.

A burner of the character described above, may be economically constructed, is inexpensive to operate, and is eflicient in its action.

1. A hydrocarbon-burner comprising a base member rovided with a centrally disposed basin or'liquid fuel, a fuel supply pipe leading to said basin, said base-mem er `having a series of outwardlystepped concentric grooves, and a cap-member seated in one of said grooves to form a preheating chamber at the top, said cap-member being provided with orifices arranged below the plane of the outer edges of said groove within which the cap-member is seated.

2. A hydrocarbon-burner comprising a. base-member provided with a central fuel basin, and with a fuel-retaining groove extending around said basin, a supply p'ipe leading to said fuel basin, and a cap-member with a downwardly presented flange arranged in said groove and having projec- 1 tions seated on the bottom of said groove,

the peripheral openings between said projections being arranged below the upper surface of contiguous portions of said basemember, said cap-member being adapted to form a fiuid seal within said groove"-tjoom plete an alr-excluding preheating chamber gg for the fuel.

3. A hydrocarbon-burner comprising a base-member provided with a central fuel basin and a fuel-retaining groove extending around said basin, a supply pipe leading to said fuel basin, and a cap-member with downwardly presented projections seated on the bottom of said Groove, the ,peripheral openings between said member contiguous to said groove, said lcapmember being provided with a peripheral portion overhanging said upper surface of the base member around said groove.

,4. In combination, a liquid fuel burner comprisinnr a base provided with a central basin for liquid fuel, a fuel-supply pipe opening upwardly thru the bottom wall of said projections being arranged below the upper surface of said base.

basin, an imperforate cap arranged over.

ing on the bottom wall of said depressed groove, said ca being provided with discharge outlets elow the upper outer edge of said depressed Groove for forming a fluid seal around said fuel basin, and means for supplying liquid fuel to said fuel basin.

6. In an oil burner, the combination with a burner provided with a fuel basin and with a depressed circular groove extending completely around said basing, of a cap resting on the bottom wall of said depressed groove, said cap being provided with discharge outlets below the upper outer edge of' said depressed groovevfor forming a fiuid seal around said fuel basin, and means for supplying liquid fuel to said fuel basin, said cap being provided with an outwardly-presented ledge spaced from and overhanging the outer edge of said depressed groove.

7 A burner provided with an annular receptacle for liquid fuel and a raised basin for fuel centrally disposed with respect thereto, a fuel-supply pipe leading to said basin, and an inverted cup-shaped cap provided with legs resting upon the bottom of the annular receptacle for supporting the cap over said basin, said cap forming a fuel-Vaporizing chamberand adapted to form a fluid seal with fuel in said annular receptacle.

JAMES OTIS POST. 

